Ingredients

1. 2 1/4 cups self-rising cake flour
2. 3/4 cup unsweetened cocoa
3. 3/4 teaspoon baking soda
4. 2 sticks ( 1/2 pound) unsalted butter, softened
5. 2 cups sugar
6. 3 large eggs
7. 1 teaspoon pure vanilla extract
8. 1 cup sour cream
9. 2 ounces bittersweet or semisweet chocolate, cut into 1/4 -inch pieces
10. 1/2 cup water
11. Decadent Soft Chocolate Cream
12. Softly whipped cream, for serving

Directions

1. Preheat the oven to 325°. Lightly butter a 10-inch loaf pan and line the bottom with parchment or wax paper; butter the paper.
2. In a medium bowl, whisk together the flour, cocoa and baking soda. In a large bowl, using an electric mixer, beat the butter with 1 cup of the sugar at medium speed until blended. Add the eggs, 1 at a time, beating well after each addition. Add the vanilla. On low speed, alternately beat in the sour cream and the dry ingredients in 3 batches. Add the chocolate pieces and beat just until combined. Scrape the batter into the prepared pan and bake for about 1 hour and 10 minutes, or until a toothpick inserted into the center comes out with only a few moist crumbs attached. Let the cake cool on a rack for 15 minutes, then unmold and let cool right side up. 
3. In a small saucepan, combine the remaining 1 cup of sugar with the water and simmer for 5 minutes, stirring to dissolve the sugar. Brush a thin layer of the glaze over the cake and let set. Brush the cake with the glaze 2 more times, allowing it to dry between glazings. 
4. Cut the cake into 3/4 -inch-thick slices and serve with the Decadent Soft Chocolate Cream and whipped cream.

Make Ahead

The cake can be wrapped well and kept at room temperature for 1 day.